/* $NetBSD: kgetcred.c,v 1.3.8.1 2023/08/11 13:39:56 martin Exp $ */ /* * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan * (Royal Institute of Technology, Stockholm, Sweden). * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the Institute nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "kuser_locl.h" static char *cache_str; static char *out_cache_str; static char *delegation_cred_str; static char *etype_str; static int transit_flag = 1; static int forwardable_flag; static int canonicalize_flag; static int is_hostbased_flag; static int is_canonical_flag; static char *impersonate_str; static char *nametype_str; static int store_flag = 1; static int cached_only_flag; static int anonymous_flag; static int debug_flag; static int version_flag; static int help_flag; struct getargs args[] = { { "cache", 'c', arg_string, &cache_str, NP_("credential cache to use", ""), "cache"}, { "out-cache", 0, arg_string, &out_cache_str, NP_("credential cache to store credential in", ""), "cache"}, { "delegation-credential-cache",0,arg_string, &delegation_cred_str, NP_("where to find the ticket use for delegation", ""), "cache"}, { "canonicalize", 0, arg_flag, &canonicalize_flag, NP_("canonicalize the principal (chase referrals)", ""), NULL }, { "canonical", 0, arg_flag, &is_canonical_flag, NP_("the name components are canonical", ""), NULL }, { "forwardable", 0, arg_flag, &forwardable_flag, NP_("forwardable ticket requested", ""), NULL}, { "transit-check", 0, arg_negative_flag, &transit_flag, NULL, NULL }, { "enctype", 'e', arg_string, &etype_str, NP_("encryption type to use", ""), "enctype"}, { "impersonate", 0, arg_string, &impersonate_str, NP_("client to impersonate", ""), "principal"}, { "name-type", 0, arg_string, &nametype_str, NP_("Kerberos name type", ""), NULL }, { "hostbased", 'H', arg_flag, &is_hostbased_flag, NP_("indicate that the name is a host-based service name", ""), NULL }, { "store", 0, arg_negative_flag, &store_flag, NP_("don't store the tickets obtained in the cache", ""), NULL }, { "cached-only", 0, arg_flag, &cached_only_flag, NP_("don't talk to the KDC, just search the cache", ""), NULL }, { "anonymous", 'n', arg_flag, &anonymous_flag, NP_("request an anonymous ticket", ""), NULL }, { "debug", 0, arg_flag, &debug_flag, NULL, NULL }, { "version", 0, arg_flag, &version_flag, NULL, NULL }, { "help", 0, arg_flag, &help_flag, NULL, NULL } }; static void usage(int ret) { arg_printusage(args, sizeof(args)/sizeof(*args), NULL, "service"); exit (ret); } int main(int argc, char **argv) { krb5_error_code ret; krb5_context context; krb5_ccache cache; krb5_creds *out; int optidx = 0; int32_t nametype = KRB5_NT_UNKNOWN; krb5_get_creds_opt opt; krb5_principal server = NULL; krb5_principal impersonate; setprogname(argv[0]); ret = krb5_init_context(&context); if (ret) errx(1, "krb5_init_context failed: %d", ret); if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx)) usage(1); if (help_flag) usage (0); if (version_flag) { print_version(NULL); exit(0); } argc -= optidx; argv += optidx; if (debug_flag) { ret = krb5_set_debug_dest(context, getprogname(), "STDERR"); if (ret) krb5_warn(context, ret, "krb5_set_debug_dest"); } if (cache_str) { ret = krb5_cc_resolve(context, cache_str, &cache); if (ret) krb5_err(context, 1, ret, "%s", cache_str); } else { ret = krb5_cc_default (context, &cache); if (ret) krb5_err(context, 1, ret, "krb5_cc_resolve"); } ret = krb5_get_creds_opt_alloc(context, &opt); if (ret) krb5_err(context, 1, ret, "krb5_get_creds_opt_alloc"); if (etype_str) { krb5_enctype enctype; ret = krb5_string_to_enctype(context, etype_str, &enctype); if (ret) krb5_errx(context, 1, N_("unrecognized enctype: %s", ""), etype_str); krb5_get_creds_opt_set_enctype(context, opt, enctype); } if (impersonate_str) { ret = krb5_parse_name(context, impersonate_str, &impersonate); if (ret) krb5_err(context, 1, ret, "krb5_parse_name %s", impersonate_str); krb5_get_creds_opt_set_impersonate(context, opt, impersonate); krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE); krb5_free_principal(context, impersonate); } if (out_cache_str) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE); if (forwardable_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE); if (!transit_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_TRANSIT_CHECK); if (canonicalize_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CANONICALIZE); if (!store_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_NO_STORE); if (cached_only_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CACHED); if (anonymous_flag) krb5_get_creds_opt_add_options(context, opt, KRB5_GC_ANONYMOUS); if (delegation_cred_str) { krb5_ccache id; krb5_creds c, mc; Ticket ticket; krb5_cc_clear_mcred(&mc); ret = krb5_cc_get_principal(context, cache, &mc.server); if (ret) krb5_err(context, 1, ret, "krb5_cc_get_principal"); ret = krb5_cc_resolve(context, delegation_cred_str, &id); if(ret) krb5_err(context, 1, ret, "krb5_cc_resolve"); ret = krb5_cc_retrieve_cred(context, id, 0, &mc, &c); if(ret) krb5_err(context, 1, ret, "krb5_cc_retrieve_cred"); ret = decode_Ticket(c.ticket.data, c.ticket.length, &ticket, NULL); if (ret) { krb5_clear_error_message(context); krb5_err(context, 1, ret, "decode_Ticket"); } krb5_free_cred_contents(context, &c); ret = krb5_get_creds_opt_set_ticket(context, opt, &ticket); if(ret) krb5_err(context, 1, ret, "krb5_get_creds_opt_set_ticket"); free_Ticket(&ticket); krb5_cc_close(context, id); krb5_free_principal(context, mc.server); krb5_get_creds_opt_add_options(context, opt, KRB5_GC_CONSTRAINED_DELEGATION); } if (nametype_str != NULL) { ret = krb5_parse_nametype(context, nametype_str, &nametype); if (ret) krb5_err(context, 1, ret, "krb5_parse_nametype"); } if (nametype == KRB5_NT_SRV_HST || nametype == KRB5_NT_SRV_HST_NEEDS_CANON) is_hostbased_flag = 1; if (is_hostbased_flag) { const char *sname = NULL; const char *hname = NULL; if (nametype_str != NULL && nametype != KRB5_NT_SRV_HST && nametype != KRB5_NT_SRV_HST_NEEDS_CANON) krb5_errx(context, 1, "--hostbased not compatible with " "non-hostbased --name-type"); if (is_canonical_flag) nametype = KRB5_NT_SRV_HST; else nametype = KRB5_NT_SRV_HST_NEEDS_CANON; /* * Host-based service names can have more than one component. * * RFC5179 did not, but should have, assign a Kerberos name-type * corresponding to GSS_C_NT_DOMAINBASED. But it's basically a * host-based service name type with one additional component. * * So that's how we're treating host-based service names here: * two or more components. */ if (argc == 0) { usage(1); } else if (argc == 1) { krb5_principal server2; /* * In this case the one argument is a principal name, not the * service name. * * We parse the argument as a principal name, extract the service * and hostname components, use krb5_sname_to_principal(), then * extract the service and hostname components from that. */ ret = krb5_parse_name(context, argv[0], &server); if (ret) krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]); sname = krb5_principal_get_comp_string(context, server, 0); /* * If a single-component principal name is given, then we'll * default the hostname, as krb5_principal_get_comp_string() * returns NULL in this case. */ hname = krb5_principal_get_comp_string(context, server, 1); ret = krb5_sname_to_principal(context, hname, sname, KRB5_NT_SRV_HST, &server2); if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal %s %s", sname, hname); sname = krb5_principal_get_comp_string(context, server2, 0); hname = krb5_principal_get_comp_string(context, server2, 1); /* * Modify the original with the new sname/hname. This way we * retain any additional principal name components from the given * principal name. * * The name-type is set further below. */ ret = krb5_principal_set_comp_string(context, server, 0, sname); if (ret) krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]); ret = krb5_principal_set_comp_string(context, server, 1, hname); if (ret) krb5_err(context, 1, ret, "krb5_principal_set_comp_string %s", argv[0]); krb5_free_principal(context, server2); } else { size_t i; /* * In this case the arguments are principal name components. * * The service and hostname components can be defaulted by passing * empty strings. */ sname = argv[0]; if (*sname == '\0') sname = NULL; hname = argv[1]; if (hname == NULL || *hname == '\0') hname = NULL; ret = krb5_sname_to_principal(context, hname, sname, KRB5_NT_SRV_HST, &server); if (ret) krb5_err(context, 1, ret, "krb5_sname_to_principal"); for (i = 2; i < argc; i++) { ret = krb5_principal_set_comp_string(context, server, i, argv[i]); if (ret) krb5_err(context, 1, ret, "krb5_principal_set_comp_string"); } } } else if (argc == 1) { ret = krb5_parse_name(context, argv[0], &server); if (ret) krb5_err(context, 1, ret, "krb5_parse_name %s", argv[0]); } else { usage(1); } if (nametype != KRB5_NT_UNKNOWN) server->name.name_type = (NAME_TYPE)nametype; ret = krb5_get_creds(context, opt, cache, server, &out); if (ret) krb5_err(context, 1, ret, "krb5_get_creds"); if (out_cache_str) { krb5_ccache id; ret = krb5_cc_resolve(context, out_cache_str, &id); if(ret) krb5_err(context, 1, ret, "krb5_cc_resolve"); ret = krb5_cc_initialize(context, id, out->client); if(ret) krb5_err(context, 1, ret, "krb5_cc_initialize"); ret = krb5_cc_store_cred(context, id, out); if(ret) krb5_err(context, 1, ret, "krb5_cc_store_cred"); krb5_cc_close(context, id); } krb5_free_creds(context, out); krb5_free_principal(context, server); krb5_get_creds_opt_free(context, opt); krb5_cc_close (context, cache); krb5_free_context (context); return 0; }